So I have found with my 7970 that I can go over 1300Mhz on the core, but only if I lower my memory to under 1800Mhz... So is this due to the card using all available power? I have noticed others on the charts that went over 1300Mhz core but had to lower Mem freq.

Any ideas?

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A lot of people are having success using the Asus bios and Voltage Tweak for getting 1300+.

Its quite common that you cant push both as high as they go together.. I dont think its a power limit... but it is quite common. That said, try the Asus bios and voltage tweak like erocker mentioned above.

That's always been the case with video cards to my knowledge. Yes, you can push the core to "X" and the ram to "Y" and have each one stable by themselves, but if you try to set both at the same time it's no longer stable.

Finally got my koolance block in today and was able to reach a higher overclock. I was able to hit 1300 Mhz on the core with 1.25 V. My last card with was a msi 6970 gave me all kinds of fits with cold temps but I have had my 7970 as low as 3C at idle!!!